Birdsell, a close student of the Australian aborigines, finds three strains in these peoples, one of which is traceable to the “white” Ainus, of northern Japan, and finally to what he calls the Amurians of the aforementioned river basin. In Australia their descendants are rather short and stocky, with a “rough-hewn Caucasoid cast of features.” Their craniums are long and low, with large brow ridges—general traits of Pleistocene man as well as some of our possibly early, and certainly problematical, Americans. Coon supposes that natural selection among the Amurians—trapped by the advance of the fourth glaciation or one of its substages—produced certain Mongoloid features that they later carried into the New World. Birdsell sees among the early migrants no Negritos, no full-sized Negroids, no so-called Melanesians, no Mediterranean type of Caucasoids. He suggests that a much-mixed strain of Caucasoid Amurians and the newly evolved Mongoloid race accounts for earliest man in the Americas. These “present the only discernible elements available at the proper time and place to have contributed importantly to the New World populations.... One may speculate that if human populations reached the New World in the third interglacial they could be expected to be purely Caucasoid, that is Amurian, and to show no Mongoloid characteristics.” Birdsell suggests that migrants coming after the last glaciation would carry some Mongoloid features through hybridization. Guardedly, Birdsell insists that, though this is a satisfying and stimulating hypothesis, we have as yet no means of judging accurately racial affiliations from a single cranium or entire populations. He concludes—somewhat sadly, we surmise—that methods utilized as recently as 1949 (the date of his proposal) offer no promise of unraveling in detail the enigma of the origins of our earliest Americans. 10 DID THE INDIAN INVENT OR BORROW HIS CULTURE? _American anthropologists usually deny that Old World cultures have influenced to any great extent the pre-Columbian development of the American Indian. We have set up for Aboriginal America a sort of_ ex post facto _Monroe Doctrine and are inclined to regard suggestions of alien influences as acts of aggression. This is probably a scientifically tenable position, although I am afraid it has often been maintained in part by an emotional bias—an “America for Americans” feeling._ —EARNEST A. HOOTON Diffusion vs. Independent Invention We hope you have not been skipping the choice thoughts that we have placed at the beginning of chapters. Some of them are merely amusing, but certain ones make an important point. Such is the above remark from Hooton. It calls our attention to an unscientific emotionalism which often lies behind one of the dogmas of American archaeology.